Issue with image overlay on background

I wanted to overlay image on my dashboard with green light or red light depending on a search result. I'm putting the images and CSS in a separate folder as shown in the code attachment. My expected output is to have light under each rectangular box and color of the light depend on search query. I did follow the link provided by @NiketNilay, but my output is not showing up. I have attached the output i m seeing. It looks like the CSS file is not being picked or the value is not picked. I m not sure where the problem is, any help would be really grateful.>

stylesheet="/static/app/BatchDashboard/images/custom_layout_overlay_icon_mod.css">>Image Overlay with> icons id="ST_upstream_status">>host="swaroops-MacBook-Pro.local"> "Total Records processed" | stats> count>$earliest$>$latest$>>>>redlight_mod1.png>0>>>>case($result.count$>=1> ,"greenlight_mod1.png")>$result.count$>>>>

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$ST_upstream_value$>>

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$SOA_status_value$>>

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$ST_downstream_value$>>

I m unable to post the output pic, so i can just tell that the output is showing up as an image which i want, but then the green/blue light is not shown and the value for ST_upstream etc is not at the desired location rather at the bottom after the image. I would be grateful for any help. Thanks Swaroop